Related to or produced by a volcano; can also describe something very sudden, violent, or explosive.
From Latin 'Vulcanus,' the Roman god of fire and metalworking; the adjective developed from the god's name to describe volcanoes and volcanic activity, then expanded to describe anything explosive.
Volcanic glass (obsidian) is so sharp that modern surgeons sometimes use it for surgery instead of steel because it's sharper than any blade we can make—ancient peoples knew this and used obsidian for tools 100,000 years ago.
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